Man it sounds like anxiety. I use to have bad chest pains, and trouble with breathing. Then I started blacking out. I went to the Hospitial and had every test run, they said I was fine. Then I went to two different doctors and let them run tests. They said I was fine. I went to another Doctor and he ran some tests and sat down and talked to me for a couple of hours. He said it was Panic Attacks from anxiety. I got on Paxil, and started to write down what I was doing when I felt that way to pinpoint what was trigging it. Anxiety attacks are rough, and only get worst if you don't treat it. You could have something different then me, but I hope that helps any. Take care.